package com.hqyj.springboot.listener;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import javax.servlet.annotation.WebListener;
import java.io.File;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;

/**
 * 监听器有request监听器、context监听器、session监听器
 */
@WebListener
public class LogListener implements ServletContextListener {
 private final static Logger LOGGER = LoggerFactory.getLogger(LogListener.class);

    @Override
    public void contextInitialized(ServletContextEvent sce) {
        LOGGER.debug("===Init log Listener====");


        //获取D://var/log 日志文件夹，判断是否存在，如果不存在则直接返回

        File file = new File("/var/log");
        if (file == null){
            return;
        }

        //获取当前日期字符串
        DateTimeFormatter dtf = DateTimeFormatter.ofPattern("yyyy-MM-dd");
        String currentDateString = dtf.format(LocalDateTime.now());

        //获取/var/log下的日志文件，循环判断文件名称是否包含日期字符串，不包含则删除
        File[] files = file.listFiles();
        for(File temp : files){
            String name = temp.getName();
            if (!name.contains(currentDateString)){
                temp.delete();
            }
        }



    }

    @Override
    public void contextDestroyed(ServletContextEvent sce) {
        LOGGER.debug("===Destroyed Log Listener===");
    }
}
